"This proves that people confronted with stereotypes generally behave in line with them," Thierry Meyer, joint author of the study and professor of social psychology at the University of Paris X-Nanterre, told the Times of London. "In this case blondes have the potential to make people act in a dumber way, because they mimic the unconscious stereotype of the dumb blonde."

The study indicates a belief by scientists that stereotyping is a powerful driving force in interacting with others.

For example, previous research found that people talk more slowly in front of the elderly, the Times reported.